Hydrocarbons 2 Question 73
78. Following statements are true, only under some specific conditions. Write the condition for each subquestion in not more than two sentences :
(i) 2-methyl propene can be converted into isobutyl bromide by hydrogen bromide.
(ii) Ethyne and its derivatives will give white precipitate with ammoniacal silver nitrate solution.
$(1984,1 \mathrm{M} \times 2=2 \mathrm{M})$
Show Answer
Solution:
- (i)
In the absence of peroxide, $\mathrm{HBr}$ would be added giving tertiary butyl bromide.
(ii) Tertiary alkynes are slightly acidic, forms silver salt with ammoniacal solution of silver nitrate :
$$ R-\mathrm{C} \equiv \mathrm{C}-\mathrm{H}+\mathrm{AgNO}{3} \xrightarrow{\mathrm{NH}{3}(a q)} R-\mathrm{C} \equiv \mathrm{CAg} \downarrow $$
